I’m not sure if this kind of device is right or not, but WiFly-City claimed to be able to ‘unlocked’ most of locked WiFi Network and providing you up to 10-times higher transmission distance so you can actually let your PC/laptop sniffs for WiFi network in the range of 1 kilometers. I certainly won’t believe it until I’ve tried it myself. However, it would be interesting to be able to get a free WiFi network access where you’ve no need pay a dime for it.